Improvement in machines for forming pipe-elbows



UNITED f STATES CHARLES HOELLEH, (on CINCINNATI, o-HIo, AssIeNoE To 'HIMsELE rparlarvi OFFICE.

HENRY S. HOELLER, OF SAME PLAGE.

specinmion forming part or Letters Patent No. 113,167, dated March 28,1811.

To all whom t may concern: i Y

Be it known that I, CHARLES HOELLEH, of Cincinnati, in the .county of Hamilton and State of Ghio, have invented a certain Improved Machine for Forming Elbows for Stove and other Pipes, of which the following is a specification:

The rstpart of my invention relates to an open cylinder secured at one end to the frame of the machine, and having pivoted or hinged to its free end a circular compressor, so constructed and operated in combination with concentric clamps that the straight tube of sheet metal, when secured in place between the cylinder-head, circular compressor, and their respective concentric clamps, will be folded in the form of a rib, outwardly, the object of this part of the invention being to curve the straight tube by folding the metal upon one side only. l

The second part of my invention relates tov the device for feeding out the tube of sheet lmetal to form the elbow. It consists in a cylindrical collar, which is moved freely upon the outside of the open cylinder by the attached ratchet-bar, to which motion is imparted at stated intervals by the operation of` an eccentric connected with a pawl or plunger engaging the ratchet-bar.

Figure 1 is a plan of my improved machine for forming elbows. Fig. 2 is a longitudinal vertical section of the same. Fig. 3 is an end elevation of the forming end of the machine. Fig. 4 is a side elevation of the rear end of the machine.

A is the frame of the machine, to the rear end a of which is rmly secured the open cylinder B. The cylinder is isolated throughout its entire length. Its free end is enlarged, forming the cylinder-head D, which is enlarged up in the shape of a semi-ellipse in the center and top, and gradually vanishing before com- .pleting the circle.

The piston E, located in the open cylinder, has one end wedge-shaped, e. The faces thereof fiare outwardly. This wedge-shaped end c is located in the central opening in the circular compressor F, which is hinged or pivoted by bolt f, at its lower edge, to the end of the` cylinder-head D.

naled in the rear end of the machine.

A steel plate, b, is let'into a recess in the `compressor F, to which it is confined by the D.` Its interior surface is recessed to correspond with the raised central part of the face of the head D. v

p One of the clamps, 1, is pivoted, beneath the head D,to the frame A. Its other end termi* nates in an arm, c, Vextending outwardly, and

bifurcated at c. The clamp 2 is also recessed on its .interior surface, while the free end'terminates in a shorter arm, c, and is rounded off on its outer face. thejclamp l, below the bifurcation, and to the ends of the lever h. The lower end of the clamp 2 is pivoted to an independent arm, and is provided with a toothed surface, which engages the pinion 7c, attached to and operated by the presser-bar Z.

G is the clamp concentric to the circular compressor F, and diifers from the clamp G in one respect--the inner surfaces of its two parts, 3 and 4, are without the groove, quite narrow, and the side is beveled off outwardly.

One end of the piston E is connected with the eccentric H on the shaft I, which is jour- An eccentric, J, also secured to the shaft I, is located in the sliding box J This box: is attached to the plunger-guide K, within which is located the freely-moving plunger K',.with its lower end in contact with the teeth of the ratchetbar L, which is secured to the cylindrical collar M.

In the frontend of the freely-moving collar M is a circular groove for the reception of one end of the tube for forming the elbow.

N is the lever, attached to the shaft I, by means of which the eccentrics are rotated.

A sheet of metal of the requisite dimensions having Vbeen rolled in the form of a cylinder is passed over the cylinderhead D and circu lar compressor F, and its end inserted in the groove in the face of the movable collar M, to which it is fastened by a small eccentric-lever. The tube, with the collar M, is then pushed Ann i,

Links g are pivoted to back so far thatv but three or six inches of they other end extends outwardly from the. co'mpressor F. l l

pThe clamp G is closed up on the tube by means of the eccentric-lever h,whereby an elevation of the metal is induced between the faces of the cylinder-head and clamp, the former having an elevation and the latter a corresponding groove in their surfaces. Opening c clamp G and lowering lever N, the collar M,

with the attached tube, moves forward a dstance due to the length of ratchet-teeth on the bar L, which places the elevation which forms Ya semicircle about Vthe tube exactly between the compressor F and head D.. Both clamps, Gr and G', are closed upon the tube, firmly locking the tube upon the head D and compressor F, which are hinged together on the lower side, and stand apart on the upper side a distance equal to twice the depth of the rib to be. formed. The lever N is then moved upwardly, turning the eccentric connected with the piston E, thereby drawing together the compressor F, with its locked clamp G', and the head D, with clamp G, in consequence of which the already-corrugated metal will be folded' outward, and, being compressed with great force, forms a sharplyd'elined rib, R, which projects fromthe surface of least curvature of the elbow T. This operation is repeated as often as necessary for the production of f a complete elbow.

An important feature of my invention is the provision of the bead and groove inv the head f D and clamp G, respectively, the head having l from the top to points near'the bottom of head D, and the groove in the clamp corresponding in shape. This device gives apreliminary crimp to bend easily and correctly in the formation of the finalE crimp between the compressor F and head D.

I claim as my invention- 1. The cylinder-head D, compressor F and clamps G G', combined, constructed, and operating substantially in the manner herein shown and described.

collar M, and mechanism for feeding the sliding collar by successive steps, substantially as and for the purpose speciied.

3. The clamp G, hinged compressor F, and piston E, when constructedl and operating sub- CHARLES HOELLER.

v Witnesses:

C; L, F'IsHER,

Cms. Conn..

a projection gradual-1y decreasing on each side-1 or corrugation to the metal, which enables it.

2'. The combination of cylinder B D, sliding stantially in the manner and for the purpose 

